Patents by Inventor Koutaro Nonumura

Koutaro Nonumura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for dyeing aluminum-containing zinc-based alloys
    Patent number: 4200475
    Abstract: A process for dyeing an aluminum-containing zinc-based alloy, which comprises immersing an aluminum-containing zinc-based alloy in an alkaline solution containing hexavalent chromium ion, further immersing the thus treated alloy in an acidic aqueous solution and then dyeing the thus further treated alloy in an aqueous solution of an organic dyestuff thereby to obtain a dyed aluminum-containing zinc-based alloy having decorative appearance and corrosion resistance.
    Type: Grant
    Filed: September 26, 1978
    Date of Patent: April 29, 1980
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventors: Nobuyoshi Kasahara, Koutaro Nonumura